Physics Test 25...

The superposition takes place between two waves of frequency f and amplitude a. The maximum intensity I_max = constant × ____

A particle having mass m and charge q is released from the origin in a region in which electric field and magnetic fields are given by  Find the speed of the particle as a function of its z coordinate.

An object O is kept in front of a converging lens of focal length 30 cm behind which there is a plane mirror at 15 cm from the lens. Choose the correct statements.

A TV tower has a height of 50 m. The maximum distance up to which TV transmission can be received is approximately equal to (radius of earth = 6.4 × 10⁶ m)

Which statement(s) is/are true?

(i) Kirchhoff's law is equally applicable to both AC and DC.

(ii) Semiconductors have a positive temperature coefficient of resistance.

(iii) Meter bridge has a greater sensitivity when the resistances of all the four arms of the bridge are of the same order.

(iv) The emf of a cell depends upon the size and area of electrodes.

These question consists of two statements each printed as assertion and reason. While answering these question you are required to choose any one of the following five responses.

Assertion: Small water drops are spherical while bigger water drops are not.

Reason: In small water drops surface tension forces dominate while in bigger water drops gravity forces dominate.

Suppose that the angular velocity of rotation of Earth is increased. Then, as a consequence,

A man grows into a giant such that his linear dimensions increase by a factor of 9. Assuming that his density remains same, the stress in the leg will change by a factor of:

The dipole moment of a circular loop carrying a current 'I' is 'm' and the magnetic field at the centre of the loop is B₁. When the dipole moment is doubled by keeping the current constant, the magnetic field at the centre of the loop is B₂. The ratio B₁/B₂ is

The equivalent capacitance between A and B in the circuit given below is: